Kūgo Ginjō vs Aumvor the Undying: who would win?

Aumvor the Undying favored — Slight edge (~55%)

Kūgo Ginjō · Bleach · Lost Agent Arc

Tier

HIGH 6-A, up to 4-A

Attack Potency

Multi-Continent Level, up to Multi-Solar System Level

Speed

Massively Hypersonic

Durability

Multi-Continent Level, up to Multi-Solar System Level

Aumvor the Undying · Dungeons & Dragons · Base

Tier

HIGH 6-A

Attack Potency

Multi-Continent Level

Speed

Relativistic+, up to Ftl+

Durability

Multi-Continent Level

A heuristic estimate from normalized VS Battles Wiki stats: tier, attack potency, speed and durability.